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200 kHz commercial sonar systems generate lower frequency side lobes audible to some marine mammals
Deng, Z.D.; Southall, B.L.; Carlson, T.J.; Xu, J.; Martinez, J.J.; Weiland, M.A.; Ingraham, J.M. (2014). 200 kHz commercial sonar systems generate lower frequency side lobes audible to some marine mammals. PLoS One 9(4): 6 pp. hdl.handle.net/10.1371/journal.pone.0095315
In: PLoS One. Public Library of Science: San Francisco. ISSN 1932-6203, more
Peer reviewed article  

Available in Authors 

Keywords
Author keywords
    Acoustic signals Acoustics Bioacoustics Hearing Marine fish Marine mammals Sonar Whales

Authors  Top 
  • Deng, Z.D.
  • Southall, B.L.
  • Carlson, T.J.
  • Xu, J.
  • Martinez, J.J.
  • Weiland, M.A.
  • Ingraham, J.M.

Abstract
    The spectral properties of pulses transmitted by three commercially available 200 kHz echo sounders were measured to assess the possibility that marine mammals might hear sound energy below the center (carrier) frequency that may be generated by transmitting short rectangular pulses. All three sounders were found to generate sound at frequencies below the center frequency and within the hearing range of some marine mammals, e.g. killer whales, false killer whales, beluga whales, Atlantic bottlenose dolphins, harbor porpoises, and others. The frequencies of these sub-harmonic sounds ranged from 90 to 130 kHz. These sounds were likely detectable by the animals over distances up to several hundred meters but were well below potentially harmful levels. The sounds generated by the sounders could potentially affect the behavior of marine mammals within fairly close proximity to the sources and therefore the exclusion of echo sounders from environmental impact analysis based solely on the center frequency output in relation to the range of marine mammal hearing should be reconsidered.

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